condition mean min max ZT0-3 0.0 0.0 0.0 ZT4-7 0.0 0.0 0.0 ZT8-11 0.469583 0.469583 0.469583 ZT12-15 0.045261 0.0 0.090522 ZT16-19 0.0 0.0 0.0 ZT20-23 0.581315 0.581315 0.581315